A material screening mechanism for a ball mill
By introducing screening and receiving devices into the ball mill, short-stroke return and vibration filtration of large particles are achieved, solving the problems of blockage and waste of large particles and improving the crushing efficiency and energy utilization of the ball mill.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- FUJIAN ZHIFENG PRECISION TECHNOLOGY CO LTD
- Filing Date
- 2025-08-22
- Publication Date
- 2026-07-24
AI Technical Summary
In existing ball mills, large particles are prone to clogging the conveying pipe when returning to the feed end, resulting in raw material waste, increased energy consumption, and low crushing efficiency.
Design a material screening mechanism for a ball mill, including a screening device and a receiving device. A short-stroke return of large particles is achieved through a discharge drive device and a return drive device. Combined with the vibration filtration of a U-shaped screening channel and a vibrating trough plate, it ensures that large particles are quickly returned to the cylinder for further crushing.
It improves the recycling and crushing efficiency of large particles, reduces raw material waste and energy consumption, and ensures stable screening and secondary crushing of materials.
Smart Images
Figure CN224541868U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of material screening mechanisms, specifically a material screening mechanism for ball mills. Background Technology
[0002] Ball mills are key pieces of equipment for further pulverizing materials after they have been crushed. This type of mill uses a certain number of steel balls as the grinding media inside its cylinder. It can be divided into dry grinding and wet grinding methods, and according to the discharge method, it can be divided into grate-type discharge and overflow-type discharge.
[0003] In the processing of cemented carbide materials, ball mills with wet grinding and overflow discharge are mainly used for raw material crushing. The material discharged from this type of ball mill is slurry-like, and small particles that meet the standard particle size need to be screened out before output. To avoid raw material waste, existing technologies typically return the oversized particles screened out to the feed end of the ball mill through a conveyor pipe, mix them with the raw material blocks, and then re-feed them into the ball mill for crushing. However, this design requires large particles to travel a long distance from the discharge end to the feed end. During the return process, large particles are very likely to remain in the conveyor pipe, causing raw material waste or blockage of the conveyor pipe. Furthermore, large particles that have already been crushed but do not meet the particle size standard are subjected to ball milling again from the beginning, which can easily lead to over-grinding, wasting ball mill energy and reducing crushing efficiency.
[0004] The research objective of this utility model is to design a material screening mechanism for ball mills to address the problems existing in the prior art. Utility Model Content
[0005] To address the problems existing in the prior art, this utility model provides a material screening mechanism for ball mills, which can effectively solve the problems existing in the prior art.
[0006] The technical solution of this utility model is:
[0007] A material screening mechanism for a ball mill, comprising:
[0008] A screening device includes a housing that is rotatably connected to the discharge end of a ball mill, a discharge channel, a screening channel, and a return channel located within the housing and connected in sequence. The discharge channel is connected to the discharge end, and the return channel extends through the discharge end to the cylinder of the ball mill via a return pipe. The discharge channel is equipped with a discharge drive device for driving the overflowing slurry from the discharge end toward the screening channel. The bottom of the screening channel is detachably equipped with a filter element for trapping large particles. The return channel is equipped with a return drive device for driving the large particles output from the screening channel toward the return pipe.
[0009] The receiving device has a receiving end that is connected to the lower side of the filter element and is used to receive small particulate materials filtered through by the filter element.
[0010] Furthermore, the screening channel is U-shaped, and the discharge channel and return channel are respectively connected to the two ends of the screening channel. The side wall of the housing is provided with a slot corresponding to the bottom of the screening channel, and the slot is used for detachable installation of the filter element.
[0011] Furthermore, the housing is embedded with vibrating groove plates with openings facing each other. Elastic sheets are respectively provided on the upper and lower sides of the vibrating groove plates. The side wall of the housing is provided with a plurality of vibration driving devices that connect the two vibrating groove plates through a rotating shaft. An eccentric wheel is sleeved on the rotating shaft. The slot is formed between the two vibrating groove plates. The filter element includes a frame for screwing into the slot and a filter screen disposed in the frame. When the vibration driving device drives the rotating shaft and the eccentric wheel to rotate, it drives the two vibrating groove plates to vibrate, thereby driving the filter element to vibrate and filter.
[0012] Furthermore, the discharge drive device includes a discharge spiral blade rotatably disposed in the discharge channel and a discharge motor for driving the discharge spiral blade to rotate; the return drive device includes a return spiral blade rotatably disposed in the return channel and a return motor for driving the return spiral blade to rotate.
[0013] Furthermore, the return pipe extends through the discharge end into the cylinder and then downwards to the bottom of the cylinder to form a return end.
[0014] Furthermore, the cylinder has a feed end and a discharge end at both ends. The cylinder is divided by a filter plate to form a coarse grinding chamber and a fine grinding chamber that are connected and respectively connected to the feed end and the discharge end. The coarse grinding chamber is provided with a number of large grinding balls, and the fine grinding chamber is provided with a number of large grinding balls and a number of small grinding balls. The return end is located at the bottom of the fine grinding chamber.
[0015] Therefore, the beneficial effects of this utility model are:
[0016] 1. By adding a screening device, the slurry material discharged from the ball mill discharge end passes through the discharge channel, screening channel, and return channel in sequence. The filter element in the screening channel traps large particles and filters out small particles to the receiving device. The trapped large particles accumulate and are pushed towards the return channel, returning to the ball mill cylinder through the discharge end for further crushing before being discharged again. This not only achieves material screening but also allows large particles that do not meet the requirements to be quickly and short-stroke returned to the ball mill cylinder through the discharge end. This replaces the existing design of conveying large particles to the cylinder feed end through a long-stroke conveying pipe for return, which can greatly improve the return efficiency and amount of large particles, reduce raw material waste, and allow large particles that have already been crushed but whose particle size is not up to standard to return to the rear end of the cylinder for further crushing instead of returning to the cylinder feed end. As the material flows towards the discharge end, it only undergoes short-stroke secondary crushing, which can reduce the waste of ball mill energy due to over-grinding and improve the crushing efficiency of the ball mill.
[0017] 2. By setting the screening channel to a U-shape, the length of the screening channel is extended, allowing the material to be fully screened as it enters the screening channel driven by the discharge drive device and moves towards the return channel. This prevents small particles from returning to the return channel. Furthermore, the U-shaped folding extension of the screening channel shortens the return journey of the material after screening, allowing the material to be immediately driven back into the cylinder by the return drive device after being output from the screening channel, thus improving the return efficiency of large particles.
[0018] 3. By adding vibrating trough plates and a vibration drive device, the vibration drive device drives the rotating shaft and eccentric wheel to rotate, causing the two vibrating trough plates to vibrate, which in turn causes the filter elements to vibrate and filter. The rotation of the eccentric wheel achieves minute vibrations of the vibrating trough plates and filter elements, simulating the shaking action of the filter elements. This allows small particles to pass through the filter screen more quickly and fall down, preventing small particles from clogging the filter screen and affecting the filtration effect. Furthermore, the addition of elastic sheets buffers the vibration of the vibrating trough plates and provides a sealing effect.
[0019] 4. By extending the return end to the bottom of the cylinder, large particles can be directly returned to the bottom of the cylinder instead of floating on the surface of the slurry inside the cylinder and then overflowing out with the slurry, thus avoiding repeated processing. This ensures that the large particles sink to the bottom after being returned, and are then crushed into smaller particles by the ball mill media before floating out and overflowing out. This improves the efficiency and stability of the discharge of large particles after secondary crushing, and enhances the effect and stability of the return of large particles. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the ball mill and the material screening mechanism.
[0021] Figure 2 This is a cross-sectional schematic diagram of the material screening mechanism.
[0022] Figure 3 for Figure 2 A three-dimensional structural diagram after removing the discharge drive device and the return drive device.
[0023] Figure 4 This is a schematic diagram of the filter element.
[0024] Figure 5 This is a schematic diagram of the vibration drive device.
[0025] Figure 6 This is a schematic diagram of the longitudinal section of the material screening mechanism.
[0026] Figure 7 This is a cross-sectional view of the ball mill and the material screening mechanism, but the material screening mechanism is not shown in the cross-section. Detailed Implementation
[0027] To facilitate understanding by those skilled in the art, the structure of this utility model will now be described in further detail with reference to the accompanying drawings:
[0028] refer to Figure 1-7 A material screening mechanism for a ball mill, comprising:
[0029] The screening device 1 includes a housing 11 that is rotatably connected to the discharge end 31 of a ball mill, a discharge channel 12, a screening channel 13, and a return channel 14 disposed within the housing 11 and connected in sequence. The discharge channel 12 is connected to the discharge end 31, and the return channel 14 passes through the discharge end 31 to the cylinder 3 of the ball mill via a return pipe 15. The discharge channel 12 is provided with a discharge drive device 16 for driving the slurry overflowing from the discharge end 31 to move toward the screening channel 13. The bottom of the screening channel 13 is detachably provided with a filter element 17 for intercepting large particles. The return channel 14 is provided with a return drive device 18 for driving the large particles output from the screening channel 13 to move toward the return pipe 15.
[0030] The receiving device 2 has a receiving end 21 that is connected to the lower side of the filter element 17 and is used to receive small particulate materials filtered by the filter element 17.
[0031] The above structure, through the addition of the screening device 1, allows the slurry material discharged from the ball mill discharge end 31 to pass through the discharge channel 12, screening channel 13, and return channel 14 in sequence. During this process, the filter element 17 of the screening channel 13 traps large particles and filters out small particles to the receiving device 2. The trapped large particles accumulate and are pushed towards the return channel 14, returning to the ball mill cylinder 3 via the discharge end 31 for further crushing before being discharged again. This not only achieves material screening but also allows for the rapid removal of non-compliant large particles. The short-stroke return of material to the ball mill cylinder 3 via the discharge end 31 replaces the existing design of conveying large particles to the feed end of the cylinder 3 via a long-stroke conveying pipe. This greatly improves the return efficiency and amount of large particles, reduces raw material waste, and allows large particles that have already been crushed but whose particle size is not up to standard to return to the rear end of the cylinder 3 for further crushing instead of returning to the feed end 32. As the material flows toward the discharge end 31, it only undergoes a short-stroke secondary crushing, which reduces the waste of ball mill energy due to over-grinding and improves the crushing efficiency of the ball mill.
[0032] To improve material screening efficiency and return efficiency, the screening channel 13 is U-shaped. The discharge channel 12 and return channel 14 are connected to the two ends of the screening channel 13, respectively. The side wall of the housing 11 is provided with a slot corresponding to the bottom of the screening channel 13, which is used for detachable installation of the filter element 17. The above structure extends the length of the screening channel 13 by making it U-shaped, so that the material can be fully screened as it is driven into the screening channel 13 by the discharge drive device 16 and moves towards the return channel 14, avoiding small particles from returning to the return channel 14. In addition, the U-shaped extension of the screening channel 13 shortens the return journey of the material after screening, so that the material can be immediately driven back into the cylinder 3 by the return drive device 18 after being output from the screening channel 13, improving the return efficiency of large particles.
[0033] To improve material screening efficiency, the housing 11 is embedded with vibrating groove plates 111 with openings facing each other. Elastic sheets 112 are respectively provided on the upper and lower sides of the vibrating groove plates 111. Specifically, the elastic sheets 112 can be made of materials such as rubber or silicone. The sidewall of the housing 11 is provided with several vibration drive devices 19 connected to the two vibrating groove plates 111 via a rotating shaft 191. An eccentric wheel 192 is sleeved on the rotating shaft 191, forming a slot between the two vibrating groove plates 111. The filter element 17 includes a frame 171 for screwing into the slot and a filter screen 172 disposed within the frame 171. The above structure, through the addition of the vibrating groove plates 111 and the vibration drive devices 19, enables the vibration drive devices 19 to drive the rotating shaft 191 and the eccentric wheel 192 to rotate, thereby causing the two vibrating groove plates 111 to vibrate, and consequently causing the filter element 17 to vibrate and filter. The rotation of the eccentric wheel 192 causes the vibrating trough plate 111 and the filter element 17 to vibrate slightly, simulating the shaking action of the filter element 17. This allows small particles to pass through the filter screen 172 more quickly and fall down, while preventing small particles from clogging the filter screen 172 and affecting the filtration effect. In addition, the elastic sheet 112 is used to buffer the vibration of the vibrating trough plate 111 and provide a sealing effect.
[0034] To improve the material conveying efficiency of the discharge channel 12 and the return channel 14, the discharge drive device 16 includes a discharge spiral blade 161 rotatably disposed within the discharge channel 12 and a discharge motor 162 for driving the discharge spiral blade 161 to rotate. The return drive device 18 includes a return spiral blade 181 rotatably disposed within the return channel 14 and a return motor 182 for driving the return spiral blade 181 to rotate. Specifically, one end of the shaft 191 of the discharge spiral blade 161 and the return spiral blade 181 rotatably passes through the housing 11 and is connected to the discharge electrolysis and return motor 182, respectively; the other end is rotatably connected to the inner wall of the discharge channel 12 and the inner wall of the return channel 14, respectively, thereby ensuring the stability of the rotation drive of the discharge spiral blade 161 and the return spiral blade 181.
[0035] To improve the stability of large particle material return, the return pipe 15 extends through the discharge end 31 into the cylinder 3 and then downwards to the bottom of the cylinder 3 to form a return end 151. By extending the return end 151 to the bottom of the cylinder 3, large particles can be directly returned to the bottom of the cylinder 3, preventing them from floating on the surface of the slurry inside the cylinder 3 and overflowing out with the slurry, thus avoiding repeated processing. This ensures that the large particles settle to the bottom after return, undergo secondary crushing by the ball milling media into smaller particles before floating and overflowing out. This improves the efficiency and stability of the discharge after secondary crushing of large particles, and enhances the effectiveness and stability of large particle material return.
[0036] To improve the crushing effect of materials, the cylinder 3 includes a feed end 32 and a discharge end 31 at both ends. The cylinder 3 is divided by a filter plate 35 to form a coarse grinding chamber 33 and a fine grinding chamber 34 that are connected and respectively connect the feed end 32 and the discharge end 31. The coarse grinding chamber 33 contains several large grinding balls, and the fine grinding chamber 34 contains several large grinding balls and several small grinding balls. The return end 151 is located at the bottom of the fine grinding chamber 34. Thus, by setting up the coarse grinding chamber 33 and the fine grinding chamber 34, the material is first coarsely ground and then finely ground by different media, which can improve the grinding efficiency of the material. Furthermore, returning large particles to the fine grinding chamber 34 can further improve the return effect, allowing the returned large particles to be further crushed into smaller particles by the large and small grinding balls before being discharged. If the existing technology is used to return large particles to the coarse grinding chamber 33, the secondary discharge efficiency of the returned material will be greatly reduced, thus reducing the secondary crushing effect.
[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A material screening mechanism for a ball mill, characterized in that, include: The screening device (1) includes a housing (11) that is sealed and rotatably connected to the discharge end (31) of the corresponding ball mill, a discharge channel (12), a screening channel (13), and a return channel (14) disposed in the housing (11) and connected in sequence. The discharge channel (12) is connected to the discharge end (31). The return channel (14) passes through the discharge end (31) to the cylinder (3) of the ball mill through the return pipe (15). The discharge channel (12) is provided with a discharge drive device (16) for driving the slurry overflowing from the discharge end (31) to move toward the screening channel (13). The bottom of the screening channel (13) is detachably provided with a filter element (17) for intercepting large particles. The return channel (14) is provided with a return drive device (18) for driving the large particles output from the screening channel (13) to move toward the return pipe (15). The receiving device (2) has a receiving end (21) that is connected to the lower side of the filter element (17) and is used to receive small particulate materials filtered by the filter element (17).
2. The material screening mechanism for a ball mill as described in claim 1, characterized in that, The screening channel (13) is U-shaped. The discharge channel (12) and return channel (14) are respectively connected to the two ends of the screening channel (13). The side wall of the housing (11) is provided with a slot corresponding to the bottom of the screening channel (13). The slot is used to detachably install the filter element (17).
3. A material screening mechanism for a ball mill as described in claim 2, characterized in that, The housing (11) is embedded with vibrating groove plates (111) with openings facing each other. Elastic sheets (112) are respectively provided on the upper and lower sides of the vibrating groove plates (111). The side wall of the housing (11) is provided with a plurality of vibration driving devices (19) that are connected to the two vibrating groove plates (111) by a rotating shaft (191). An eccentric wheel (192) is sleeved on the rotating shaft (191). The slot is formed between the two vibrating groove plates (111). The filter element (17) includes a frame (171) for screwing into the slot and a filter screen (172) provided in the frame (171). When the vibration driving device (19) drives the rotating shaft (191) and the eccentric wheel (192) to rotate, it drives the two vibrating groove plates (111) to vibrate, thereby driving the filter element (17) to vibrate and filter.
4. A material screening mechanism for a ball mill as described in claim 1, characterized in that, The discharge drive device (16) includes a discharge spiral blade (161) rotatably disposed in the discharge channel (12) and a discharge motor (162) for driving the discharge spiral blade (161) to rotate. The return drive device (18) includes a return spiral blade (181) rotatably disposed in the return channel (14) and a return motor (182) for driving the return spiral blade (181) to rotate.
5. A material screening mechanism for a ball mill as described in claim 1, characterized in that, The return pipe (15) passes through the discharge end (31) into the cylinder (3) and then extends downward to the bottom of the cylinder (3) to form the return end (151).
6. A material screening mechanism for a ball mill as described in claim 5, characterized in that, The cylinder (3) has a feed end (32) and a discharge end (31) at both ends. The cylinder (3) is divided by a filter plate (35) to form a coarse grinding chamber (33) and a fine grinding chamber (34) that are connected and respectively connected to the feed end (32) and the discharge end (31). The coarse grinding chamber (33) is provided with a number of large grinding balls, and the fine grinding chamber (34) is provided with a number of large grinding balls and a number of small grinding balls. The return end (151) is located at the bottom of the fine grinding chamber (34).